Broken `plone_basic` scaffolding?

[gforcada]

• bobtemplates.plone version: 6.3.1 (with plonecli 2.5 if that matters)
• Python version: 3.11.6
• Operating System: Fedora Linux 39

Description

After creating a basic_theme with plonecli, the toolbar and generally mockup is not loading?

What I Did

• I followed the training to create a theme from scratch
• I build plone plonecli build
• I started it ./bin/instance fg
• I created a new plone instance (Classic UI)
• the default theme works fine and great 🌟
• I got to the add-ons sections and install my add-on
• the screenshot above is what I get to see 😕

I did not find a way to pin the specific Plone 6.0.x version I wanted, I would have liked to test it on 6.0.0 and then do a binary search through the versions if that one worked, is that not possible? 🤔

[gforcada]

As another data point:

If I go to the src/my/addon/theme and run:

npm install
npm run build

... and restart the instance, the brokenness is still there 😕